package com.zhou.pc;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class B {
    public static void main(String[] args) {
        Data2 data = new Data2();

        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                try {
                    data.increment();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }, "A").start();
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                try {
                    data.decrement();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }, "B").start();
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                try {
                    data.increment();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }, "C").start();
        new Thread(()->{
            for (int i = 0; i < 10; i++) {
                try {
                    data.decrement();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }, "D").start();
    }
}
class Data2{
    private int count = 0;
    private int bufferCount = 1;

    Lock lock = new ReentrantLock();
    Condition condition = lock.newCondition();
    //判断等待,执行操作,通知线程
    //+1
    public void increment() throws InterruptedException {
        lock.lock();
        try {
            while(count >= bufferCount){
                condition.await();
            }
            count++;
            System.out.println(Thread.currentThread().getName()+"-->"+count);
            condition.signalAll();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }

    }
    //-1
    public void decrement() throws InterruptedException {
        lock.lock();
        try {
            while(count <= 0){
                condition.await();
            }
            count--;
            System.out.println(Thread.currentThread().getName()+"-->"+count);
            condition.signalAll();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }

    }
}